President Donald Trump announced Friday his intent to nominate Pennsylvania Rep. Tom Marino to oversee the Office of National Drug Control Policy. (Bill Clark/CQ Roll Call File Photo)

President Donald Trump’s long-expected nomination of two Republican congressmen to posts in his administration could set up special elections in two safe GOP House seats with already crowded fields of potential candidates.

Trump on Friday evening announced his intent to nominate Oklahoma Rep. Jim Bridenstine to be administrator of NASA and Pennsylvania Rep. Tom Marino to be director of the Office of National Drug Control Policy.